Abstract
In 1987 a theory for the generation of a macroscopic electron current based on directional photo-ionization was put forth.1 This model proposes that defect states within the fiber irradiated by a field and its harmonic could make single-photon and two-photon transitions to states above the mobility edge. The model predicts an interference effect between the two channels which results in a phase dependent anisotropy and the ejection of the electron with a preferred direction. This basic idea has been modified to better account for the location of defect states in the silica gap by increasing the order of the process.2
© 1991 Optical Society of America
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